US3964487A - Uncomplicated load-adapting electrosurgical cutting generator - Google Patents

Uncomplicated load-adapting electrosurgical cutting generator Download PDF

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Publication number
US3964487A
US3964487A US05/530,701 US53070174A US3964487A US 3964487 A US3964487 A US 3964487A US 53070174 A US53070174 A US 53070174A US 3964487 A US3964487 A US 3964487A
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signal generator
transformer
amplifier
cutting
load
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US05/530,701
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Donald W. Judson
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Birtcher Corp
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Birtcher Corp
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Assigned to CHASE MANHATTAN BANK, AS ADMINISTRATIVE AGENT, THE reassignment CHASE MANHATTAN BANK, AS ADMINISTRATIVE AGENT, THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ASPEN LABORATORIES, INC. (CO CORPORATION), BIRTCHER MEDICAL SYSTEMS, INC. (CA CORPORATION), CONMED ANDOVER MEDICAL, INC. (NY CORPORATION), CONMED CORPORATION (NY CORPORATION), CONSOLIDATED MEDICAL EQUIPMENT INTERNATIONAL, INC. (NY CORPORATION), ENVISION MEDICAL CORPORATION, (CA CORPORATION), LINVATEC CORPORATION (FL CORPORATION), NDM, INC. (NY CORPORATION)
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • A61B18/1206Generators therefor
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B18/04Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
    • A61B18/12Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00642Sensing and controlling the application of energy with feedback, i.e. closed loop control
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/0066Sensing and controlling the application of energy without feedback, i.e. open loop control
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00696Controlled or regulated parameters
    • A61B2018/00755Resistance or impedance
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B18/00Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
    • A61B2018/00636Sensing and controlling the application of energy
    • A61B2018/00773Sensed parameters
    • A61B2018/00875Resistance or impedance

Definitions

  • the present invention relates generally to improvements in cutting signal generators in electrosurgical devices, and more particularly pertains to new and improved oscillator circuitry utilized for generating high frequency cutting signals.
  • This object and the general purpose of this invention are accomplished by providing a transistor regenerative feedback oscillator-amplifier that has a load-coupling transformer in the collector circuit along with a feedback coupling winding to provide regenerative feedback to the base circuit which contains the frequency determining elements.
  • the output signal from this oscillator-amplifier is applied to human tissue for cutting purposes.
  • FIG. 1 is a block diagram illustration of a typical electrosurgical device.
  • FIG. 2 is a circuit diagram of the preferred embodiment of the cutting signal generator of this invention.
  • a power supply 11 supplies DC power to a switching device 15 by way of cable 13.
  • the switching device 15 may be mechanically or electromechanically actuated and is intercoupled electromechanically 31 with a switching device 29 at the output of a coagulating signal generator 21 and a cutting signal generator 23.
  • Switching device 15 selectively supplies energy from the power supply to the coagulating signal generator 21 over cable 17.
  • the coagulating signal generator 21 may be a spark-gap oscillator that supplies high current, high frequency, damped oscillations over cable 25 to switching device 29.
  • Switching device 29 may contain manually adjustable signal controls and path selection devices to, for example, switch the coagulating signal to line 33.
  • Line 33 is then connected to a surgical instrument.
  • Line 39 may be connected to the grounding or "indifferent" plate, contacting the patient and acts as a return path for the electrosurgical signal.
  • switching device 15 supplies DC energy from the power supply 11 to the cutting signal generator 23 by way of cable 19.
  • the cutting signal generator 23 is a medium frequency, high power oscillator-amplifier that generates a continuous signal. This signal is supplied to switching device 29 over cable 29. Switching device 29 connects this signal to a cutting terminal 35 which is connected to a surgical instrument (not shown). Electrosurgical devices such as, illustrated by FIG. 1, are well known in the prior art.
  • the cutting signal generator 23, illustrated in FIG. 2, is uniquely designed to accommodate itself to the varying load conditions presented by the human body.
  • the load 59 connected across the cutting signal generator output lines 27a, 27b may go from infinite impedance to zero impedance. However, practically speaking, when operating in the human body, the load can vary from several thousand ohms down to around 30 ohms.
  • the cutting signal generator 23 comprises an NPN transistor amplifier 53 shown to be configured in a commonemitter arrangement.
  • the transistor amplifier is illustrated as being made up of one transistor. However, it should be understood that as many transistors as is necessary, connected in parallel, may be utilized to achieve the desired power output.
  • the transistor amplifier 53 is connected as a regenerative feedback oscillator by way of a feedback transformer having a primary winding 41 and a secondary winding 43.
  • Primary winding 47 of the load transformer is connected in series with the primary winding 41 of the feedback transformer.
  • the secondary winding 45 of the load transformer is connected to the load 59 over output lines 27a, 27b.
  • the transistor amplifier 53 is biased by a resistor 49, which keeps the collector terminal at side 1 of resistor 49 positive with respect to the base at side 2 of the resistor 49. It should be understood that this NPN arrangement is only exemplary and that PNP transistors may be used as well, the biasing being rearranged appropriately.
  • a DC voltage from the power supply 11 is supplied to side 1 of the primary winding 41 over line 19.
  • the secondary winding 43 of the transformer inversely couples the signal in the primary winding 41 to the base of transistor 53 by way of capacitor 51.
  • One side of the secondary winding 43 is grounded, while the other side is connected to one side of capacitor 51.
  • the emitter of the transistor 53 is also grounded.
  • the primary winding 47 and secondary winding 45 couple the signal in the collector circuit of transistor 53, without inversion, to the load.
  • the effective inductance of the winding 43 in the feedback loop and the capacitance of capacitor 51 in the feedback loop determine the time constant of the regenerative feedback oscillator circuit illustrated.
  • the frequency of the output signal is determined by the value of inductor 43 and the value of capacitor 51.
  • the electromagnetic field caused by primary winding 41 is coupled to secondary winding 43 which is wound to cause polarity inversion.
  • terminal 4 of winding 43 will be positive and terminal 3 will be negative when terminal 1 of primary winding 41 is positive and terminal 2 is negative.
  • the current induced in secondary winding 43 will cause a positive charge build-up on plate 1 of capacitor 51.
  • the other side or plate 2 of capacitor 51 will, therefore, have an increasing negative charge. This increasing negative charge at plate 2 acts to further bias the transistor 53 in the forward direction, causing an increase in base current 63, which in turn causes an increase in collector current 61 and emitter current 65.
  • the capacitor 51 will start discharging through inductor 43 to ground, according to the particular time constant dictated by the values of capacitor 51 and inductor 43. This discharge action causes the base current 63 to decrease, thereby decreasing the collector current 61 and the emitter current 65 of transistor 53. Since the collector current is now collapsing, the feedback coupling between primary winding 41 and the secondary winding 43, will aid this process, causing the capacitor to discharge until the transistor 53 is driven to cut-off as exhibited by practically zero emitter current and collector current.
  • plate 1 of capacitor 51 has reached its maximum negative charge, as shown by the second half cycle of wave 53.
  • the other plate 2 of capacitor 51 has, in turn reached its maximum positive charge, as shown by the second half cycle of wave 56.
  • the biasing resistor 49 maintains the transistor in a forward bias condition, thereby causing base current 63 to again increase, in turn increasing emitter current 65 and collector current 61. This action causes a repeat of the first half cycle, as shown by waves 55 and 56. Oscillation will continue in this manner until removal of the DC supply from side 1 of the primary winding 41 of the feedback transformer.
  • the primary winding 47 and the secondary winding 45 couple the load 59 into the collector circuit of the transistor 53. What in effect occurs by this arrangement, is the load impedance of the load 59 is reflected back into the primary 47 of the transformer so that, effectively, primary winding 47 may be replaced by the reflected impedance value of the load. Therefore, primary winding 47, secondary winding 45 and the load 59 can be thought of as a variable impedance in the collector circuit.
  • the load impedance is increasing and the collector current is in an increasing cycle.
  • the increasing impedance will cause the collector current to decrease.
  • This causes the voltage drop across the primary winding 41 to decrease correspondingly, thereby decreasing the feedback signal and causing the charge on capacitor 51 to decrease.
  • This decreases the forward bias of the transistor 53 which causes a decrease in the base current 63 and a commensurate decrease in the collector current 61.
  • the combination of a decreasing collector current with an increasing reflected load impedance keeps the voltage across the load from swinging sharply to a value above the desired maximum.
  • the oscillator of FIG. 2 controls the change in current through the load, thereby also preventing erratic swings in load current.

Abstract

A high frequency signal for cutting human tissue is generated by common-emitter configured oscillator circuit that is adapted to maintain the cutting signal relatively constant in spite of impedance variations in the load caused by variations in the conduction of the tissue being cut.

Description

BACKGROUND OF THE INVENTION
The present invention relates generally to improvements in cutting signal generators in electrosurgical devices, and more particularly pertains to new and improved oscillator circuitry utilized for generating high frequency cutting signals.
In the field of electrosurgical devices, it has been the practice to employ various types of electrosurgical generators suitable for generating cutting and coagulation currents. In some cases, the currents are provided by separate generators, one generator providing a cutting current and the other generator providing a coagulation current. In other cases, a single generator is utilized to provide both a cutting and coagulating current, or a combination of such currents. These prior art electrosurgical instruments, whether they used separate signal generators or one signal generator for producing the various types of signals required, either ignore the problem of the patient acting as a varying impedance load, or compensate for it by expensive and complicated means.
SUMMARY OF THE INVENTION
An object of this invention is to provide an electrosurgical device that provides a relatively constant tissue cutting signal, in spite of impedance changes in the load.
This object and the general purpose of this invention are accomplished by providing a transistor regenerative feedback oscillator-amplifier that has a load-coupling transformer in the collector circuit along with a feedback coupling winding to provide regenerative feedback to the base circuit which contains the frequency determining elements. The output signal from this oscillator-amplifier is applied to human tissue for cutting purposes.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and many of the attendant advantages of this invention will be readily appreciated as it becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which, like reference numerals designate like parts throughout the figures thereof and wherein:
FIG. 1 is a block diagram illustration of a typical electrosurgical device.
FIG. 2 is a circuit diagram of the preferred embodiment of the cutting signal generator of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring first to FIG. 1, the organization of an electrosurgical device that could utilize the cutting signal generator of the present invention is illustrated. A power supply 11 supplies DC power to a switching device 15 by way of cable 13. The switching device 15 may be mechanically or electromechanically actuated and is intercoupled electromechanically 31 with a switching device 29 at the output of a coagulating signal generator 21 and a cutting signal generator 23. Switching device 15 selectively supplies energy from the power supply to the coagulating signal generator 21 over cable 17.
The coagulating signal generator 21 may be a spark-gap oscillator that supplies high current, high frequency, damped oscillations over cable 25 to switching device 29. Switching device 29 may contain manually adjustable signal controls and path selection devices to, for example, switch the coagulating signal to line 33. Line 33 is then connected to a surgical instrument. Line 39 may be connected to the grounding or "indifferent" plate, contacting the patient and acts as a return path for the electrosurgical signal.
If a cutting signal is desired, switching device 15 supplies DC energy from the power supply 11 to the cutting signal generator 23 by way of cable 19. The cutting signal generator 23, as will be more fully explained hereinafter, is a medium frequency, high power oscillator-amplifier that generates a continuous signal. This signal is supplied to switching device 29 over cable 29. Switching device 29 connects this signal to a cutting terminal 35 which is connected to a surgical instrument (not shown). Electrosurgical devices such as, illustrated by FIG. 1, are well known in the prior art.
The cutting signal generator 23, illustrated in FIG. 2, is uniquely designed to accommodate itself to the varying load conditions presented by the human body. The load 59 connected across the cutting signal generator output lines 27a, 27b may go from infinite impedance to zero impedance. However, practically speaking, when operating in the human body, the load can vary from several thousand ohms down to around 30 ohms.
The cutting signal generator 23 comprises an NPN transistor amplifier 53 shown to be configured in a commonemitter arrangement. The transistor amplifier is illustrated as being made up of one transistor. However, it should be understood that as many transistors as is necessary, connected in parallel, may be utilized to achieve the desired power output. The transistor amplifier 53 is connected as a regenerative feedback oscillator by way of a feedback transformer having a primary winding 41 and a secondary winding 43. Primary winding 47 of the load transformer is connected in series with the primary winding 41 of the feedback transformer. The secondary winding 45 of the load transformer is connected to the load 59 over output lines 27a, 27b.
The transistor amplifier 53 is biased by a resistor 49, which keeps the collector terminal at side 1 of resistor 49 positive with respect to the base at side 2 of the resistor 49. It should be understood that this NPN arrangement is only exemplary and that PNP transistors may be used as well, the biasing being rearranged appropriately.
A DC voltage from the power supply 11 is supplied to side 1 of the primary winding 41 over line 19. The secondary winding 43 of the transformer inversely couples the signal in the primary winding 41 to the base of transistor 53 by way of capacitor 51. One side of the secondary winding 43 is grounded, while the other side is connected to one side of capacitor 51.
The emitter of the transistor 53 is also grounded. The primary winding 47 and secondary winding 45 couple the signal in the collector circuit of transistor 53, without inversion, to the load.
The effective inductance of the winding 43 in the feedback loop and the capacitance of capacitor 51 in the feedback loop determine the time constant of the regenerative feedback oscillator circuit illustrated. In other words, the frequency of the output signal is determined by the value of inductor 43 and the value of capacitor 51.
When a DC power source is supplied to terminal 1 of primary coil 41, by way of line 19, the polarity of the primary winding will be plus at terminal 1 and minus at terminal 2. The polarity of primary winding 47 will be plus on top and minus on the bottom. The polarity of resistor 49 will be plus at terminal 1 and minus at terminal 2. This will bias the transistor 53 in a forward direction causing base current 63 to start flowing. When such base current starts flowing, collector current 61 and emitter current 65 will also start flowing in the direction shown by the arrows. The base current illustrated is actually electron flow. It should be understood that conventional current flows in a direction opposite to electron flow. This electron flow causes an expanding electromagnetic field in primary windings 47 and 41.
The electromagnetic field caused by primary winding 41 is coupled to secondary winding 43 which is wound to cause polarity inversion. Thereby, terminal 4 of winding 43 will be positive and terminal 3 will be negative when terminal 1 of primary winding 41 is positive and terminal 2 is negative. As electron flow increases in the collector circuit of transistor 53, the current induced in secondary winding 43, as a result of the expanding electromagnetic field in winding 41, will cause a positive charge build-up on plate 1 of capacitor 51. The other side or plate 2 of capacitor 51 will, therefore, have an increasing negative charge. This increasing negative charge at plate 2 acts to further bias the transistor 53 in the forward direction, causing an increase in base current 63, which in turn causes an increase in collector current 61 and emitter current 65.
This action will continue until the collector current 61 reaches a maximum as determined by the elements 41, 47 in the collector circuit and the transistor 53. At such time, since the current is no longer increasing, lack of an electromagnetic flux change in the primary winding 41 causes a lack of feedback current, by way of inductor 43 and capacitor 51. At such time, plate 1 of capacitor 51 has reached its maximum positive charge, as shown by the first half cycle of wave 55. The opposite plate 2 of capacitor 51, at this time has reached its maximum negative charge as shown by the first half cycle of wave 56.
The capacitor 51 will start discharging through inductor 43 to ground, according to the particular time constant dictated by the values of capacitor 51 and inductor 43. This discharge action causes the base current 63 to decrease, thereby decreasing the collector current 61 and the emitter current 65 of transistor 53. Since the collector current is now collapsing, the feedback coupling between primary winding 41 and the secondary winding 43, will aid this process, causing the capacitor to discharge until the transistor 53 is driven to cut-off as exhibited by practically zero emitter current and collector current.
At this time, plate 1 of capacitor 51 has reached its maximum negative charge, as shown by the second half cycle of wave 53. The other plate 2 of capacitor 51 has, in turn reached its maximum positive charge, as shown by the second half cycle of wave 56.
The biasing resistor 49 maintains the transistor in a forward bias condition, thereby causing base current 63 to again increase, in turn increasing emitter current 65 and collector current 61. This action causes a repeat of the first half cycle, as shown by waves 55 and 56. Oscillation will continue in this manner until removal of the DC supply from side 1 of the primary winding 41 of the feedback transformer.
The primary winding 47 and the secondary winding 45 couple the load 59 into the collector circuit of the transistor 53. What in effect occurs by this arrangement, is the load impedance of the load 59 is reflected back into the primary 47 of the transformer so that, effectively, primary winding 47 may be replaced by the reflected impedance value of the load. Therefore, primary winding 47, secondary winding 45 and the load 59 can be thought of as a variable impedance in the collector circuit.
Bearing this in mind, it can be seen that as the value of the load impedance in the collector circuit of transistor 53 decreases, the collector current will increase. Assuming that the collector current 61 is in the increasing part of its cycle, a decreasing load impedance will tend to increase the collector current causing the voltage drop across the primary winding 41 to become larger. This increasing voltage drop is coupled from the primary winding 41 to the secondary winding 43, which in turn increases the feedback signal to the capacitor 51 thereby further forwarding biasing the transistor 53. This increased forward biasing increases the base current 63, the collector current 61 and the emitter current 65. The increasing collector current will compensate commensurately for the decreasing reflected impedance of the load to keep the voltage across the load from swinging sharply to a value below the desired minimum.
Assume now that the load impedance is increasing and the collector current is in an increasing cycle. The increasing impedance will cause the collector current to decrease. This causes the voltage drop across the primary winding 41 to decrease correspondingly, thereby decreasing the feedback signal and causing the charge on capacitor 51 to decrease. This decreases the forward bias of the transistor 53 which causes a decrease in the base current 63 and a commensurate decrease in the collector current 61. Here, the combination of a decreasing collector current with an increasing reflected load impedance keeps the voltage across the load from swinging sharply to a value above the desired maximum.
Besides stabilizing the voltage swings across the load, the oscillator of FIG. 2 controls the change in current through the load, thereby also preventing erratic swings in load current.
In summary, what has been disclosed is an electrosurgical device that utilizes an uncomplicated and inexpensive oscillator-amplifier circuit for generating tissue cutting signals. The oscillator-amplifier is designed to inexpensively adapt itself to impedance changes of the load. Obviously, many modifications and variations of the foregoing disclosure, as illustrated by the preferred embodiment, are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims the invention may be practiced otherwise than as specifically described.

Claims (13)

What is claimed is:
1. In an electrosurgical device having a power supply, a cutting signal generator driven by said power supply, and switching means for selecting the output signal of said generator for supply to a varying impedance cutting electrode load, the improvement therein being a cutting signal generator comprising:
amplifier means having an input and output circuit for supplying an output current in its output circuit which varies inversely with the impedance variation of said load; and
means coupling the output current variation of said amplifier means to the input circuit of said amplifier means for causing said amplifier means to controllably reinforce the current variation in its output circuit.
2. The cutting signal generator of claim 1 wherein said coupling means include means for providing positive feedback to the input circuit of said amplifier means.
3. The cutting signal generator of claim 1 wherein said amplifier means comprises a transistor amplifier.
4. The cutting signal generator of claim 3 wherein said transistor amplifier comprises an NPN configured amplifier circuit.
5. The cutting signal generator of claim 4 further comprising a biasing resistor connected between the output and input circuit of said NPN transistor.
6. The cutting signal generator of claim 1 further comprising transformer means for coupling said output circuit to the load and transferring the voltage generated in the output circuit to the load.
7. The cutting signal generator of claim 1 wherein said coupling means comprises a transformer inversely coupling said output circuit to said input circuit.
8. The cutting signal generator of claim 7 further comprising a capacitor connecting said output-input coupling transformer to said input circuit, providing a desired time-constant for the cutting signal.
9. In an electrosurgical device having a power supply, a cutting signal generator driven by said power supply, and switching means for selecting the output signal of said generator for supply to a varying impedance cutting electrode load, the improvement therein being a cutting signal generator that maintains a relatively constant voltage across said varying impedance cutting electrode load, said cutting signal generator comprising:
amplifier means having an input circuit and an output circuit for amplifying the signal supplied to its input circuit;
a first coupling transformer having a primary and a secondary winding, said secondary winding being directly connected to said load and said primary winding being connected in the output circuit of said amplifier means; and
a second transformer having a primary and secondary winding, said primary winding of said second transformer being connected to the primary winding of said first transformer and said secondary winding of said second transformer being connected in the input circuit of said amplifier means in a manner to inversely couple a signal generated in the primary winding of said second transformer to the input circuit of said amplifier means.
10. The electrosurgical device of claim 9, further comprising a capacitor connected between the secondary winding of said second transformer and the input circuit of said amplifier means.
11. The electrosurgical device of claim 10 wherein the primary and secondary winding of said second transformer provide voltage inversion between the two windings.
12. The electrosurgical device of claim 10 wherein said amplifier means comprises a transistor amplifier.
13. The electrosurgical device of claim 12 wherein said transistor amplifier comprises an NPN configured amplifier circuit.
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Cited By (140)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051855A (en) * 1976-02-06 1977-10-04 Ipco Hospital Supply Corporation, Whaledent International Division Electrosurgical unit
US4092986A (en) * 1976-06-14 1978-06-06 Ipco Hospital Supply Corporation (Whaledent International Division) Constant output electrosurgical unit
US4126137A (en) * 1977-01-21 1978-11-21 Minnesota Mining And Manufacturing Company Electrosurgical unit
US4183080A (en) * 1978-06-21 1980-01-08 Theodore Liebman DC to DC converter
US4271837A (en) * 1978-01-17 1981-06-09 Aesculap-Werke Aktiengesellschaft Vormals Jetter & Scheerer Electrosurgical apparatus
US4376263A (en) * 1980-11-06 1983-03-08 Braun Aktiengesellschaft Battery charging circuit
US4569345A (en) * 1984-02-29 1986-02-11 Aspen Laboratories, Inc. High output electrosurgical unit
US4574801A (en) * 1984-02-29 1986-03-11 Aspen Laboratories, Inc. Electrosurgical unit with regulated output
US4590934A (en) * 1983-05-18 1986-05-27 Jerry L. Malis Bipolar cutter/coagulator
US4658819A (en) * 1983-09-13 1987-04-21 Valleylab, Inc. Electrosurgical generator
US4712544A (en) * 1986-02-12 1987-12-15 Castle Company Electrosurgical generator
US4739759A (en) * 1985-02-26 1988-04-26 Concept, Inc. Microprocessor controlled electrosurgical generator
US4966131A (en) * 1988-02-09 1990-10-30 Mettler Electronics Corp. Ultrasound power generating system with sampled-data frequency control
US5057748A (en) * 1989-10-16 1991-10-15 Everbrite, Inc. Power supply circuit for gas discharge tube
US5075598A (en) * 1989-10-16 1991-12-24 Everbrite, Inc. Power supply circuit for gas discharge tube
US5087860A (en) * 1989-10-16 1992-02-11 Everbrite, Inc. Power supply circuit for gas discharge tube
US5089752A (en) * 1990-09-28 1992-02-18 Everbrite, Inc. High frequency luminous tube power supply with ground fault protection
US5095890A (en) * 1988-02-09 1992-03-17 Mettler Electronics Corp. Method for sampled data frequency control of an ultrasound power generating system
US5099840A (en) * 1988-01-20 1992-03-31 Goble Nigel M Diathermy unit
US5160317A (en) * 1991-01-03 1992-11-03 Costin John A Computer controlled smart phacoemulsification method and apparatus
FR2692469A1 (en) * 1992-06-19 1993-12-24 Conmed Corp Electrosurgical trocar system with bipolar electrode.
US5279547A (en) * 1991-01-03 1994-01-18 Alcon Surgical Inc. Computer controlled smart phacoemulsification method and apparatus
US5300070A (en) * 1992-03-17 1994-04-05 Conmed Corporation Electrosurgical trocar assembly with bi-polar electrode
US5352956A (en) * 1989-10-16 1994-10-04 Everbrite Electronics, Inc. Power supply for gas discharge tube
US5370645A (en) * 1993-04-19 1994-12-06 Valleylab Inc. Electrosurgical processor and method of use
US5423848A (en) * 1992-04-14 1995-06-13 Olympus Optical Co., Ltd. Trocar
US5431664A (en) * 1994-04-28 1995-07-11 Alcon Laboratories, Inc. Method of tuning ultrasonic devices
US5496312A (en) * 1993-10-07 1996-03-05 Valleylab Inc. Impedance and temperature generator control
US5628745A (en) * 1995-06-06 1997-05-13 Bek; Robin B. Exit spark control for an electrosurgical generator
US5713896A (en) * 1991-11-01 1998-02-03 Medical Scientific, Inc. Impedance feedback electrosurgical system
US5772659A (en) * 1995-09-26 1998-06-30 Valleylab Inc. Electrosurgical generator power control circuit and method
US5808396A (en) * 1996-12-18 1998-09-15 Alcon Laboratories, Inc. System and method for tuning and controlling an ultrasonic handpiece
EP0870473A2 (en) * 1997-04-09 1998-10-14 Valleylab, Inc. Electrosurgical generator with adaptive power control
US5938677A (en) * 1997-10-15 1999-08-17 Alcon Laboratories, Inc. Control system for a phacoemulsification handpiece
US5944715A (en) * 1996-06-20 1999-08-31 Gyrus Medical Limited Electrosurgical instrument
US6004319A (en) * 1995-06-23 1999-12-21 Gyrus Medical Limited Electrosurgical instrument
US6013076A (en) * 1996-01-09 2000-01-11 Gyrus Medical Limited Electrosurgical instrument
US6015406A (en) * 1996-01-09 2000-01-18 Gyrus Medical Limited Electrosurgical instrument
US6028387A (en) * 1998-06-29 2000-02-22 Alcon Laboratories, Inc. Ultrasonic handpiece tuning and controlling device
US6027501A (en) * 1995-06-23 2000-02-22 Gyrus Medical Limited Electrosurgical instrument
US6090106A (en) * 1996-01-09 2000-07-18 Gyrus Medical Limited Electrosurgical instrument
US6093186A (en) * 1996-12-20 2000-07-25 Gyrus Medical Limited Electrosurgical generator and system
US6181075B1 (en) * 1989-10-16 2001-01-30 Everbrite Electronics, Inc. Power supply circuit for gas discharge tube
US6203541B1 (en) 1999-04-23 2001-03-20 Sherwood Services Ag Automatic activation of electrosurgical generator bipolar output
US6210403B1 (en) 1993-10-07 2001-04-03 Sherwood Services Ag Automatic control for energy from an electrosurgical generator
US6210405B1 (en) 1996-06-20 2001-04-03 Gyrus Medical Limited Under water treatment
US6261286B1 (en) 1995-06-23 2001-07-17 Gyrus Medical Limited Electrosurgical generator and system
US6277114B1 (en) 1998-04-03 2001-08-21 Gyrus Medical Limited Electrode assembly for an electrosurical instrument
US6511479B2 (en) 2000-02-28 2003-01-28 Conmed Corporation Electrosurgical blade having directly adhered uniform coating of silicone release material and method of manufacturing same
US6565561B1 (en) 1996-06-20 2003-05-20 Cyrus Medical Limited Electrosurgical instrument
WO2003092520A1 (en) 2002-05-06 2003-11-13 Sherwood Services Ag Blood detector for controlling anesu and method therefor
US20040030330A1 (en) * 2002-04-18 2004-02-12 Brassell James L. Electrosurgery systems
US6780180B1 (en) 1995-06-23 2004-08-24 Gyrus Medical Limited Electrosurgical instrument
US20040167508A1 (en) * 2002-02-11 2004-08-26 Robert Wham Vessel sealing system
US20040193148A1 (en) * 2002-02-11 2004-09-30 Wham Robert H. Vessel sealing system
US20050021022A1 (en) * 2002-09-25 2005-01-27 Sturm Thomas A. Multiple RF return pad contact detection system
US20050107780A1 (en) * 2003-11-19 2005-05-19 Goth Paul R. Thermokeratoplasty system with a calibrated radio frequency amplifier
US20050113819A1 (en) * 2003-11-21 2005-05-26 Wham Robert H. Automatic control system for an electrosurgical generator
US20050149151A1 (en) * 2003-10-30 2005-07-07 Orszulak James H. Switched resonant ultrasonic power amplifier system
US20050182398A1 (en) * 2004-02-12 2005-08-18 Paterson William G. Method and system for continuity testing of medical electrodes
US20050203504A1 (en) * 1998-10-23 2005-09-15 Wham Robert H. Method and system for controlling output of RF medical generator
US20050209561A1 (en) * 2004-03-22 2005-09-22 Raphael Gordon Method of detecting surgical events
US20050209560A1 (en) * 2004-03-22 2005-09-22 Alcon, Inc. Method of controlling a surgical system based on a rate of change of an operating parameter
US20050228425A1 (en) * 2004-03-22 2005-10-13 Alcon, Inc. Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US20050267504A1 (en) * 2004-03-22 2005-12-01 Alcon, Inc. Method of controlling a surgical system based on irrigation flow
US20050277869A1 (en) * 2004-03-22 2005-12-15 Alcon, Inc. Method of operating an ultrasound handpiece
US20060036180A1 (en) * 2004-08-12 2006-02-16 Mikhail Boukhny Ultrasonic handpiece
US20060041220A1 (en) * 2004-08-12 2006-02-23 Alcon, Inc. Ultrasound handpiece
US20060079871A1 (en) * 2004-10-13 2006-04-13 Sherwood Services Ag Universal foot switch contact port
US7044948B2 (en) 2002-12-10 2006-05-16 Sherwood Services Ag Circuit for controlling arc energy from an electrosurgical generator
US7131860B2 (en) 2003-11-20 2006-11-07 Sherwood Services Ag Connector systems for electrosurgical generator
US7137980B2 (en) 1998-10-23 2006-11-21 Sherwood Services Ag Method and system for controlling output of RF medical generator
US20070016185A1 (en) * 2005-04-29 2007-01-18 Tullis Philip J Medical Bipolar Electrode Assembly With A Cannula Having A Bipolar Active Tip And A Separate Supply Electrode And Medical Monopolar Electrode Assembly With A Cannula Having A Monopolar Active Tip And A Separate Temperature-Transducer Post
US20070149966A1 (en) * 1995-11-22 2007-06-28 Arthrocare Corporation Electrosurgical Apparatus and Methods for Treatment and Removal of Tissue
US7255694B2 (en) 2002-12-10 2007-08-14 Sherwood Services Ag Variable output crest factor electrosurgical generator
US20080172076A1 (en) * 2006-11-01 2008-07-17 Alcon, Inc. Ultrasound apparatus and method of use
US20080208207A1 (en) * 2007-02-23 2008-08-28 Huculak John C Surgical System For Indication of Media Types
US20080281253A1 (en) * 2007-05-10 2008-11-13 Injev Valentine P Method of Operating an Ultrasound Handpiece
US7513896B2 (en) 2006-01-24 2009-04-07 Covidien Ag Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US7572251B1 (en) 1995-06-07 2009-08-11 Arthrocare Corporation Systems and methods for electrosurgical tissue treatment
US7632267B2 (en) 2005-07-06 2009-12-15 Arthrocare Corporation Fuse-electrode electrosurgical apparatus
US7637907B2 (en) 2006-09-19 2009-12-29 Covidien Ag System and method for return electrode monitoring
US7648499B2 (en) 2006-03-21 2010-01-19 Covidien Ag System and method for generating radio frequency energy
US7651492B2 (en) 2006-04-24 2010-01-26 Covidien Ag Arc based adaptive control system for an electrosurgical unit
US7651493B2 (en) 2006-03-03 2010-01-26 Covidien Ag System and method for controlling electrosurgical snares
US20100036256A1 (en) * 2008-08-08 2010-02-11 Mikhail Boukhny Offset ultrasonic hand piece
US7678069B1 (en) 1995-11-22 2010-03-16 Arthrocare Corporation System for electrosurgical tissue treatment in the presence of electrically conductive fluid
US7691101B2 (en) 2006-01-06 2010-04-06 Arthrocare Corporation Electrosurgical method and system for treating foot ulcer
US20100094321A1 (en) * 2008-10-10 2010-04-15 Takayuki Akahoshi Ultrasound Handpiece
US7722601B2 (en) 2003-05-01 2010-05-25 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US7731717B2 (en) 2006-08-08 2010-06-08 Covidien Ag System and method for controlling RF output during tissue sealing
US7780662B2 (en) 2004-03-02 2010-08-24 Covidien Ag Vessel sealing system using capacitive RF dielectric heating
US7794457B2 (en) 2006-09-28 2010-09-14 Covidien Ag Transformer for RF voltage sensing
US7834484B2 (en) 2007-07-16 2010-11-16 Tyco Healthcare Group Lp Connection cable and method for activating a voltage-controlled generator
US20100324581A1 (en) * 2006-12-08 2010-12-23 Alcon, Inc. Torsional Ultrasound Hand Piece That Eliminates Chatter
US7862560B2 (en) 2007-03-23 2011-01-04 Arthrocare Corporation Ablation apparatus having reduced nerve stimulation and related methods
US7927328B2 (en) 2006-01-24 2011-04-19 Covidien Ag System and method for closed loop monitoring of monopolar electrosurgical apparatus
US7947039B2 (en) 2005-12-12 2011-05-24 Covidien Ag Laparoscopic apparatus for performing electrosurgical procedures
US20110137232A1 (en) * 2009-12-09 2011-06-09 Alcon Research, Ltd. Thermal Management Algorithm For Phacoemulsification System
US7972328B2 (en) 2006-01-24 2011-07-05 Covidien Ag System and method for tissue sealing
US8012153B2 (en) 2003-07-16 2011-09-06 Arthrocare Corporation Rotary electrosurgical apparatus and methods thereof
US8034049B2 (en) 2006-08-08 2011-10-11 Covidien Ag System and method for measuring initial tissue impedance
US8104956B2 (en) 2003-10-23 2012-01-31 Covidien Ag Thermocouple measurement circuit
US8114071B2 (en) 2006-05-30 2012-02-14 Arthrocare Corporation Hard tissue ablation system
US8147485B2 (en) 2006-01-24 2012-04-03 Covidien Ag System and method for tissue sealing
USD658760S1 (en) 2010-10-15 2012-05-01 Arthrocare Corporation Wound care electrosurgical wand
US8192424B2 (en) 2007-01-05 2012-06-05 Arthrocare Corporation Electrosurgical system with suction control apparatus, system and method
US8216223B2 (en) 2006-01-24 2012-07-10 Covidien Ag System and method for tissue sealing
US8216220B2 (en) 2007-09-07 2012-07-10 Tyco Healthcare Group Lp System and method for transmission of combined data stream
US8226639B2 (en) 2008-06-10 2012-07-24 Tyco Healthcare Group Lp System and method for output control of electrosurgical generator
US8257350B2 (en) 2009-06-17 2012-09-04 Arthrocare Corporation Method and system of an electrosurgical controller with wave-shaping
US8372067B2 (en) 2009-12-09 2013-02-12 Arthrocare Corporation Electrosurgery irrigation primer systems and methods
US8414605B2 (en) 2011-07-08 2013-04-09 Alcon Research, Ltd. Vacuum level control of power for phacoemulsification hand piece
US8486061B2 (en) 2009-01-12 2013-07-16 Covidien Lp Imaginary impedance process monitoring and intelligent shut-off
US8512332B2 (en) 2007-09-21 2013-08-20 Covidien Lp Real-time arc control in electrosurgical generators
US8568405B2 (en) 2010-10-15 2013-10-29 Arthrocare Corporation Electrosurgical wand and related method and system
US8574187B2 (en) 2009-03-09 2013-11-05 Arthrocare Corporation System and method of an electrosurgical controller with output RF energy control
US8623040B2 (en) 2009-07-01 2014-01-07 Alcon Research, Ltd. Phacoemulsification hook tip
US8663214B2 (en) 2006-01-24 2014-03-04 Covidien Ag Method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US8685018B2 (en) 2010-10-15 2014-04-01 Arthrocare Corporation Electrosurgical wand and related method and system
US8685016B2 (en) 2006-01-24 2014-04-01 Covidien Ag System and method for tissue sealing
US8734438B2 (en) 2005-10-21 2014-05-27 Covidien Ag Circuit and method for reducing stored energy in an electrosurgical generator
US8747399B2 (en) 2010-04-06 2014-06-10 Arthrocare Corporation Method and system of reduction of low frequency muscle stimulation during electrosurgical procedures
US8753334B2 (en) 2006-05-10 2014-06-17 Covidien Ag System and method for reducing leakage current in an electrosurgical generator
US8777941B2 (en) 2007-05-10 2014-07-15 Covidien Lp Adjustable impedance electrosurgical electrodes
US8784357B2 (en) 2010-09-15 2014-07-22 Alcon Research, Ltd. Phacoemulsification hand piece with two independent transducers
US8808161B2 (en) 2003-10-23 2014-08-19 Covidien Ag Redundant temperature monitoring in electrosurgical systems for safety mitigation
US8876746B2 (en) 2006-01-06 2014-11-04 Arthrocare Corporation Electrosurgical system and method for treating chronic wound tissue
US9131597B2 (en) 2011-02-02 2015-09-08 Arthrocare Corporation Electrosurgical system and method for treating hard body tissue
US9186200B2 (en) 2006-01-24 2015-11-17 Covidien Ag System and method for tissue sealing
US9358063B2 (en) 2008-02-14 2016-06-07 Arthrocare Corporation Ablation performance indicator for electrosurgical devices
US9474564B2 (en) 2005-03-31 2016-10-25 Covidien Ag Method and system for compensating for external impedance of an energy carrying component when controlling an electrosurgical generator
US9504516B2 (en) 2013-05-31 2016-11-29 Covidien LLP Gain compensation for a full bridge inverter
US9636165B2 (en) 2013-07-29 2017-05-02 Covidien Lp Systems and methods for measuring tissue impedance through an electrosurgical cable
US9693818B2 (en) 2013-03-07 2017-07-04 Arthrocare Corporation Methods and systems related to electrosurgical wands
US9713489B2 (en) 2013-03-07 2017-07-25 Arthrocare Corporation Electrosurgical methods and systems
CN107049419A (en) * 2017-05-11 2017-08-18 山东大学 A kind of Pediculus arcus vertebrae drilling device and method with force feedback
US9801678B2 (en) 2013-03-13 2017-10-31 Arthrocare Corporation Method and system of controlling conductive fluid flow during an electrosurgical procedure
US9872719B2 (en) 2013-07-24 2018-01-23 Covidien Lp Systems and methods for generating electrosurgical energy using a multistage power converter
US10258505B2 (en) 2010-09-17 2019-04-16 Alcon Research, Ltd. Balanced phacoemulsification tip

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2816230A (en) * 1955-04-13 1957-12-10 Rca Corp Blocking oscillator circuit
US2993178A (en) * 1955-03-11 1961-07-18 Siemens Reiniger Werke Ag Blocking oscillator having selectively adjustable r-c circuit
US3057356A (en) * 1960-07-22 1962-10-09 Wilson Greatbatch Inc Medical cardiac pacemaker
US3530338A (en) * 1966-09-23 1970-09-22 Karl Otto Knabe Electronic switching circuit
US3601126A (en) * 1969-01-08 1971-08-24 Electro Medical Systems Inc High frequency electrosurgical apparatus
US3675655A (en) * 1970-02-04 1972-07-11 Electro Medical Systems Inc Method and apparatus for high frequency electric surgery
US3804096A (en) * 1972-11-30 1974-04-16 Dentsply Int Inc Electrosurgical device
US3875945A (en) * 1973-11-02 1975-04-08 Demetron Corp Electrosurgery instrument
US3913583A (en) * 1974-06-03 1975-10-21 Sybron Corp Control circuit for electrosurgical units

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993178A (en) * 1955-03-11 1961-07-18 Siemens Reiniger Werke Ag Blocking oscillator having selectively adjustable r-c circuit
US2816230A (en) * 1955-04-13 1957-12-10 Rca Corp Blocking oscillator circuit
US3057356A (en) * 1960-07-22 1962-10-09 Wilson Greatbatch Inc Medical cardiac pacemaker
US3530338A (en) * 1966-09-23 1970-09-22 Karl Otto Knabe Electronic switching circuit
US3601126A (en) * 1969-01-08 1971-08-24 Electro Medical Systems Inc High frequency electrosurgical apparatus
US3675655A (en) * 1970-02-04 1972-07-11 Electro Medical Systems Inc Method and apparatus for high frequency electric surgery
US3804096A (en) * 1972-11-30 1974-04-16 Dentsply Int Inc Electrosurgical device
US3875945A (en) * 1973-11-02 1975-04-08 Demetron Corp Electrosurgery instrument
US3913583A (en) * 1974-06-03 1975-10-21 Sybron Corp Control circuit for electrosurgical units

Cited By (252)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051855A (en) * 1976-02-06 1977-10-04 Ipco Hospital Supply Corporation, Whaledent International Division Electrosurgical unit
US4092986A (en) * 1976-06-14 1978-06-06 Ipco Hospital Supply Corporation (Whaledent International Division) Constant output electrosurgical unit
US4126137A (en) * 1977-01-21 1978-11-21 Minnesota Mining And Manufacturing Company Electrosurgical unit
US4271837A (en) * 1978-01-17 1981-06-09 Aesculap-Werke Aktiengesellschaft Vormals Jetter & Scheerer Electrosurgical apparatus
US4183080A (en) * 1978-06-21 1980-01-08 Theodore Liebman DC to DC converter
US4376263A (en) * 1980-11-06 1983-03-08 Braun Aktiengesellschaft Battery charging circuit
US4590934A (en) * 1983-05-18 1986-05-27 Jerry L. Malis Bipolar cutter/coagulator
US4658819A (en) * 1983-09-13 1987-04-21 Valleylab, Inc. Electrosurgical generator
US4569345A (en) * 1984-02-29 1986-02-11 Aspen Laboratories, Inc. High output electrosurgical unit
US4574801A (en) * 1984-02-29 1986-03-11 Aspen Laboratories, Inc. Electrosurgical unit with regulated output
US4739759A (en) * 1985-02-26 1988-04-26 Concept, Inc. Microprocessor controlled electrosurgical generator
US4712544A (en) * 1986-02-12 1987-12-15 Castle Company Electrosurgical generator
US5099840A (en) * 1988-01-20 1992-03-31 Goble Nigel M Diathermy unit
US5095890A (en) * 1988-02-09 1992-03-17 Mettler Electronics Corp. Method for sampled data frequency control of an ultrasound power generating system
US4966131A (en) * 1988-02-09 1990-10-30 Mettler Electronics Corp. Ultrasound power generating system with sampled-data frequency control
US5352956A (en) * 1989-10-16 1994-10-04 Everbrite Electronics, Inc. Power supply for gas discharge tube
US5075598A (en) * 1989-10-16 1991-12-24 Everbrite, Inc. Power supply circuit for gas discharge tube
US5087860A (en) * 1989-10-16 1992-02-11 Everbrite, Inc. Power supply circuit for gas discharge tube
US5057748A (en) * 1989-10-16 1991-10-15 Everbrite, Inc. Power supply circuit for gas discharge tube
US6181075B1 (en) * 1989-10-16 2001-01-30 Everbrite Electronics, Inc. Power supply circuit for gas discharge tube
US5089752A (en) * 1990-09-28 1992-02-18 Everbrite, Inc. High frequency luminous tube power supply with ground fault protection
US5160317A (en) * 1991-01-03 1992-11-03 Costin John A Computer controlled smart phacoemulsification method and apparatus
US5279547A (en) * 1991-01-03 1994-01-18 Alcon Surgical Inc. Computer controlled smart phacoemulsification method and apparatus
US5520633A (en) * 1991-01-03 1996-05-28 Costin; John A. Computer controlled smart phacoemulsification method and apparatus
US5713896A (en) * 1991-11-01 1998-02-03 Medical Scientific, Inc. Impedance feedback electrosurgical system
US5300070A (en) * 1992-03-17 1994-04-05 Conmed Corporation Electrosurgical trocar assembly with bi-polar electrode
US5423848A (en) * 1992-04-14 1995-06-13 Olympus Optical Co., Ltd. Trocar
AU659261B2 (en) * 1992-06-19 1995-05-11 Conmed Corporation Electrosurgical trocar assembly
FR2692469A1 (en) * 1992-06-19 1993-12-24 Conmed Corp Electrosurgical trocar system with bipolar electrode.
US5370645A (en) * 1993-04-19 1994-12-06 Valleylab Inc. Electrosurgical processor and method of use
US6210403B1 (en) 1993-10-07 2001-04-03 Sherwood Services Ag Automatic control for energy from an electrosurgical generator
US5496312A (en) * 1993-10-07 1996-03-05 Valleylab Inc. Impedance and temperature generator control
US5431664A (en) * 1994-04-28 1995-07-11 Alcon Laboratories, Inc. Method of tuning ultrasonic devices
US5628745A (en) * 1995-06-06 1997-05-13 Bek; Robin B. Exit spark control for an electrosurgical generator
US7572251B1 (en) 1995-06-07 2009-08-11 Arthrocare Corporation Systems and methods for electrosurgical tissue treatment
US6261286B1 (en) 1995-06-23 2001-07-17 Gyrus Medical Limited Electrosurgical generator and system
US6416509B1 (en) 1995-06-23 2002-07-09 Gyrus Medical Limited Electrosurgical generator and system
US6004319A (en) * 1995-06-23 1999-12-21 Gyrus Medical Limited Electrosurgical instrument
US6306134B1 (en) 1995-06-23 2001-10-23 Gyrus Medical Limited Electrosurgical generator and system
US6780180B1 (en) 1995-06-23 2004-08-24 Gyrus Medical Limited Electrosurgical instrument
US6027501A (en) * 1995-06-23 2000-02-22 Gyrus Medical Limited Electrosurgical instrument
US6056746A (en) * 1995-06-23 2000-05-02 Gyrus Medical Limited Electrosurgical instrument
US6364877B1 (en) 1995-06-23 2002-04-02 Gyrus Medical Limited Electrosurgical generator and system
US6293942B1 (en) 1995-06-23 2001-09-25 Gyrus Medical Limited Electrosurgical generator method
US6174308B1 (en) 1995-06-23 2001-01-16 Gyrus Medical Limited Electrosurgical instrument
US6251106B1 (en) 1995-09-26 2001-06-26 Sherwood Services Ag Electrosurgical generator power control circuit and method
US5772659A (en) * 1995-09-26 1998-06-30 Valleylab Inc. Electrosurgical generator power control circuit and method
US7988689B2 (en) 1995-11-22 2011-08-02 Arthrocare Corporation Electrosurgical apparatus and methods for treatment and removal of tissue
US7678069B1 (en) 1995-11-22 2010-03-16 Arthrocare Corporation System for electrosurgical tissue treatment in the presence of electrically conductive fluid
US20070149966A1 (en) * 1995-11-22 2007-06-28 Arthrocare Corporation Electrosurgical Apparatus and Methods for Treatment and Removal of Tissue
US7270661B2 (en) 1995-11-22 2007-09-18 Arthocare Corporation Electrosurgical apparatus and methods for treatment and removal of tissue
US6090106A (en) * 1996-01-09 2000-07-18 Gyrus Medical Limited Electrosurgical instrument
US6015406A (en) * 1996-01-09 2000-01-18 Gyrus Medical Limited Electrosurgical instrument
US6013076A (en) * 1996-01-09 2000-01-11 Gyrus Medical Limited Electrosurgical instrument
US6234178B1 (en) 1996-01-09 2001-05-22 Gyrus Medical Limited Electrosurgical instrument
US6482202B1 (en) 1996-06-20 2002-11-19 Gyrus Medical Limited Under water treatment
US6565561B1 (en) 1996-06-20 2003-05-20 Cyrus Medical Limited Electrosurgical instrument
US6210405B1 (en) 1996-06-20 2001-04-03 Gyrus Medical Limited Under water treatment
US5944715A (en) * 1996-06-20 1999-08-31 Gyrus Medical Limited Electrosurgical instrument
US5959390A (en) * 1996-12-18 1999-09-28 Alcon Laboratories, Inc. Apparatus for tuning and controlling an ultrasonic handpiece having both a programmable broad spectrum source and a single frequency source
US5808396A (en) * 1996-12-18 1998-09-15 Alcon Laboratories, Inc. System and method for tuning and controlling an ultrasonic handpiece
US6093186A (en) * 1996-12-20 2000-07-25 Gyrus Medical Limited Electrosurgical generator and system
EP1616529A3 (en) * 1997-04-09 2006-02-15 Sherwood Services AG Electrosurgical generator
EP0870473A3 (en) * 1997-04-09 2001-01-24 Sherwood Services AG Electrosurgical generator with adaptive power control
USRE40388E1 (en) 1997-04-09 2008-06-17 Covidien Ag Electrosurgical generator with adaptive power control
EP0870473A2 (en) * 1997-04-09 1998-10-14 Valleylab, Inc. Electrosurgical generator with adaptive power control
EP1616529A2 (en) * 1997-04-09 2006-01-18 Sherwood Services AG Electrosurgical generator
US5938677A (en) * 1997-10-15 1999-08-17 Alcon Laboratories, Inc. Control system for a phacoemulsification handpiece
US6277114B1 (en) 1998-04-03 2001-08-21 Gyrus Medical Limited Electrode assembly for an electrosurical instrument
US6028387A (en) * 1998-06-29 2000-02-22 Alcon Laboratories, Inc. Ultrasonic handpiece tuning and controlling device
US8287528B2 (en) 1998-10-23 2012-10-16 Covidien Ag Vessel sealing system
US7137980B2 (en) 1998-10-23 2006-11-21 Sherwood Services Ag Method and system for controlling output of RF medical generator
US7901400B2 (en) 1998-10-23 2011-03-08 Covidien Ag Method and system for controlling output of RF medical generator
US20050203504A1 (en) * 1998-10-23 2005-09-15 Wham Robert H. Method and system for controlling output of RF medical generator
US8105323B2 (en) 1998-10-23 2012-01-31 Covidien Ag Method and system for controlling output of RF medical generator
US9168089B2 (en) 1998-10-23 2015-10-27 Covidien Ag Method and system for controlling output of RF medical generator
US9113900B2 (en) 1998-10-23 2015-08-25 Covidien Ag Method and system for controlling output of RF medical generator
US7303557B2 (en) 1998-10-23 2007-12-04 Sherwood Services Ag Vessel sealing system
US6203541B1 (en) 1999-04-23 2001-03-20 Sherwood Services Ag Automatic activation of electrosurgical generator bipolar output
US6511479B2 (en) 2000-02-28 2003-01-28 Conmed Corporation Electrosurgical blade having directly adhered uniform coating of silicone release material and method of manufacturing same
US20040193148A1 (en) * 2002-02-11 2004-09-30 Wham Robert H. Vessel sealing system
US7364577B2 (en) 2002-02-11 2008-04-29 Sherwood Services Ag Vessel sealing system
US20040167508A1 (en) * 2002-02-11 2004-08-26 Robert Wham Vessel sealing system
US20040030330A1 (en) * 2002-04-18 2004-02-12 Brassell James L. Electrosurgery systems
US7749217B2 (en) 2002-05-06 2010-07-06 Covidien Ag Method and system for optically detecting blood and controlling a generator during electrosurgery
WO2003092520A1 (en) 2002-05-06 2003-11-13 Sherwood Services Ag Blood detector for controlling anesu and method therefor
US20060025760A1 (en) * 2002-05-06 2006-02-02 Podhajsky Ronald J Blood detector for controlling anesu and method therefor
US20050021022A1 (en) * 2002-09-25 2005-01-27 Sturm Thomas A. Multiple RF return pad contact detection system
US7160293B2 (en) 2002-09-25 2007-01-09 Sherwood Services Ag Multiple RF return pad contact detection system
US7824400B2 (en) 2002-12-10 2010-11-02 Covidien Ag Circuit for controlling arc energy from an electrosurgical generator
US8523855B2 (en) 2002-12-10 2013-09-03 Covidien Ag Circuit for controlling arc energy from an electrosurgical generator
US7044948B2 (en) 2002-12-10 2006-05-16 Sherwood Services Ag Circuit for controlling arc energy from an electrosurgical generator
US7255694B2 (en) 2002-12-10 2007-08-14 Sherwood Services Ag Variable output crest factor electrosurgical generator
US7722601B2 (en) 2003-05-01 2010-05-25 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US8298223B2 (en) 2003-05-01 2012-10-30 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US8267929B2 (en) 2003-05-01 2012-09-18 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US8303580B2 (en) 2003-05-01 2012-11-06 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US8012150B2 (en) 2003-05-01 2011-09-06 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US8080008B2 (en) 2003-05-01 2011-12-20 Covidien Ag Method and system for programming and controlling an electrosurgical generator system
US8012153B2 (en) 2003-07-16 2011-09-06 Arthrocare Corporation Rotary electrosurgical apparatus and methods thereof
US8104956B2 (en) 2003-10-23 2012-01-31 Covidien Ag Thermocouple measurement circuit
US8647340B2 (en) 2003-10-23 2014-02-11 Covidien Ag Thermocouple measurement system
US8808161B2 (en) 2003-10-23 2014-08-19 Covidien Ag Redundant temperature monitoring in electrosurgical systems for safety mitigation
US20050149151A1 (en) * 2003-10-30 2005-07-07 Orszulak James H. Switched resonant ultrasonic power amplifier system
US7396336B2 (en) 2003-10-30 2008-07-08 Sherwood Services Ag Switched resonant ultrasonic power amplifier system
US8096961B2 (en) 2003-10-30 2012-01-17 Covidien Ag Switched resonant ultrasonic power amplifier system
US8485993B2 (en) 2003-10-30 2013-07-16 Covidien Ag Switched resonant ultrasonic power amplifier system
US8113057B2 (en) 2003-10-30 2012-02-14 Covidien Ag Switched resonant ultrasonic power amplifier system
US8966981B2 (en) 2003-10-30 2015-03-03 Covidien Ag Switched resonant ultrasonic power amplifier system
US9768373B2 (en) 2003-10-30 2017-09-19 Covidien Ag Switched resonant ultrasonic power amplifier system
US20050107780A1 (en) * 2003-11-19 2005-05-19 Goth Paul R. Thermokeratoplasty system with a calibrated radio frequency amplifier
EP1532952A1 (en) * 2003-11-19 2005-05-25 Refractec, Inc. Thermokeratoplasty system with a calibrated radio frequency amplifier
US7766693B2 (en) 2003-11-20 2010-08-03 Covidien Ag Connector systems for electrosurgical generator
US7416437B2 (en) 2003-11-20 2008-08-26 Sherwood Services Ag Connector systems for electrosurgical generator
US7131860B2 (en) 2003-11-20 2006-11-07 Sherwood Services Ag Connector systems for electrosurgical generator
US7300435B2 (en) 2003-11-21 2007-11-27 Sherwood Services Ag Automatic control system for an electrosurgical generator
US20050113819A1 (en) * 2003-11-21 2005-05-26 Wham Robert H. Automatic control system for an electrosurgical generator
US20050182398A1 (en) * 2004-02-12 2005-08-18 Paterson William G. Method and system for continuity testing of medical electrodes
US7766905B2 (en) 2004-02-12 2010-08-03 Covidien Ag Method and system for continuity testing of medical electrodes
US7780662B2 (en) 2004-03-02 2010-08-24 Covidien Ag Vessel sealing system using capacitive RF dielectric heating
US7713202B2 (en) 2004-03-22 2010-05-11 Alcon, Inc. Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US8523812B2 (en) 2004-03-22 2013-09-03 Alcon Research, Ltd. Method of controlling a surgical system based on a rate of change of an operating parameter
US20100036406A1 (en) * 2004-03-22 2010-02-11 Alcon, Inc. Method of Controlling a Surgical System Based on a Load on the Cutting Tip of a Handpiece
US8172786B2 (en) 2004-03-22 2012-05-08 Alcon Research, Ltd. Method of operating an ultrasound handpiece
US20050209561A1 (en) * 2004-03-22 2005-09-22 Raphael Gordon Method of detecting surgical events
US8257307B2 (en) 2004-03-22 2012-09-04 Alcon Research, Ltd. Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US8403851B2 (en) 2004-03-22 2013-03-26 Novartis Ag Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US20100130914A1 (en) * 2004-03-22 2010-05-27 Alcon, Inc. Method Of Controlling A Surgical System Based On Irrigation Flow
US7727193B2 (en) 2004-03-22 2010-06-01 Alcon, Inc. Method of controlling a surgical system based on a rate of change of an operating parameter
US8430838B2 (en) 2004-03-22 2013-04-30 Novartis Ag Method of controlling a surgical system based on irrigation flow
US9282989B2 (en) 2004-03-22 2016-03-15 Novartis Ag Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US7758538B2 (en) 2004-03-22 2010-07-20 Alcon, Inc. Method of controlling a surgical system based on irrigation flow
US20050209560A1 (en) * 2004-03-22 2005-09-22 Alcon, Inc. Method of controlling a surgical system based on a rate of change of an operating parameter
US7572242B2 (en) 2004-03-22 2009-08-11 Alcon, Inc. Method of operating an ultrasound handpiece
US7645255B2 (en) 2004-03-22 2010-01-12 Alcon, Inc. Method of controlling a surgical system based on irrigation flow
US20050228425A1 (en) * 2004-03-22 2005-10-13 Alcon, Inc. Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US7811255B2 (en) 2004-03-22 2010-10-12 Alcon, Inc. Method of controlling a surgical system based on a rate of change of an operating parameter
US7625388B2 (en) 2004-03-22 2009-12-01 Alcon, Inc. Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US8974412B2 (en) 2004-03-22 2015-03-10 Novartis Ag Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US20050261715A1 (en) * 2004-03-22 2005-11-24 Alcon, Inc. Method of controlling a surgical system based on a load on the cutting tip of a handpiece
US20050277869A1 (en) * 2004-03-22 2005-12-15 Alcon, Inc. Method of operating an ultrasound handpiece
US20110015563A1 (en) * 2004-03-22 2011-01-20 Alcon, Inc. Method Of Controlling A Surgical System Based On A Rate Of Change Of An Operating Parameter
US8048020B2 (en) 2004-03-22 2011-11-01 Alcon, Inc. Method of controlling a surgical system based on irrigation flow
US20090306583A1 (en) * 2004-03-22 2009-12-10 Mikhail Boukhny Method of Operating An Ultrasound Handpiece
US20050261628A1 (en) * 2004-03-22 2005-11-24 Alcon, Inc. Method of controlling a surgical system based on a rate of change of an operating parameter
US20050267504A1 (en) * 2004-03-22 2005-12-01 Alcon, Inc. Method of controlling a surgical system based on irrigation flow
US7645256B2 (en) 2004-08-12 2010-01-12 Alcon, Inc. Ultrasound handpiece
US20060041220A1 (en) * 2004-08-12 2006-02-23 Alcon, Inc. Ultrasound handpiece
US7651490B2 (en) 2004-08-12 2010-01-26 Alcon, Inc. Ultrasonic handpiece
US8771301B2 (en) 2004-08-12 2014-07-08 Alcon Research, Ltd. Ultrasonic handpiece
US8814894B2 (en) 2004-08-12 2014-08-26 Novartis Ag Ultrasound handpiece
US20060036180A1 (en) * 2004-08-12 2006-02-16 Mikhail Boukhny Ultrasonic handpiece
US20100004585A1 (en) * 2004-08-12 2010-01-07 Mikhail Boukhny Ultrasonic Handpiece
US20060079871A1 (en) * 2004-10-13 2006-04-13 Sherwood Services Ag Universal foot switch contact port
US7628786B2 (en) 2004-10-13 2009-12-08 Covidien Ag Universal foot switch contact port
US8025660B2 (en) 2004-10-13 2011-09-27 Covidien Ag Universal foot switch contact port
US11013548B2 (en) 2005-03-31 2021-05-25 Covidien Ag Method and system for compensating for external impedance of energy carrying component when controlling electrosurgical generator
US9474564B2 (en) 2005-03-31 2016-10-25 Covidien Ag Method and system for compensating for external impedance of an energy carrying component when controlling an electrosurgical generator
US7918852B2 (en) 2005-04-29 2011-04-05 Stryker Corporation Bipolar cannula for use with an electrode assembly having a separate supply electrode
US8852182B2 (en) 2005-04-29 2014-10-07 Stryker Corporation Electrode assembly with separate bipolar cannula and supply electrode
US20070016185A1 (en) * 2005-04-29 2007-01-18 Tullis Philip J Medical Bipolar Electrode Assembly With A Cannula Having A Bipolar Active Tip And A Separate Supply Electrode And Medical Monopolar Electrode Assembly With A Cannula Having A Monopolar Active Tip And A Separate Temperature-Transducer Post
US20110160723A1 (en) * 2005-04-29 2011-06-30 Stryker Corporation Bipolar cannula for use with an electrode assembly having a separate supply electrode
US7632267B2 (en) 2005-07-06 2009-12-15 Arthrocare Corporation Fuse-electrode electrosurgical apparatus
US8734438B2 (en) 2005-10-21 2014-05-27 Covidien Ag Circuit and method for reducing stored energy in an electrosurgical generator
US9522032B2 (en) 2005-10-21 2016-12-20 Covidien Ag Circuit and method for reducing stored energy in an electrosurgical generator
US8241278B2 (en) 2005-12-12 2012-08-14 Covidien Ag Laparoscopic apparatus for performing electrosurgical procedures
US7947039B2 (en) 2005-12-12 2011-05-24 Covidien Ag Laparoscopic apparatus for performing electrosurgical procedures
US8876746B2 (en) 2006-01-06 2014-11-04 Arthrocare Corporation Electrosurgical system and method for treating chronic wound tissue
US9168087B2 (en) 2006-01-06 2015-10-27 Arthrocare Corporation Electrosurgical system and method for sterilizing chronic wound tissue
US8636685B2 (en) 2006-01-06 2014-01-28 Arthrocare Corporation Electrosurgical method and system for treating foot ulcer
US9254167B2 (en) 2006-01-06 2016-02-09 Arthrocare Corporation Electrosurgical system and method for sterilizing chronic wound tissue
US7691101B2 (en) 2006-01-06 2010-04-06 Arthrocare Corporation Electrosurgical method and system for treating foot ulcer
US8663154B2 (en) 2006-01-06 2014-03-04 Arthrocare Corporation Electrosurgical method and system for treating foot ulcer
US8663153B2 (en) 2006-01-06 2014-03-04 Arthrocare Corporation Electrosurgical method and system for treating foot ulcer
US8663152B2 (en) 2006-01-06 2014-03-04 Arthrocare Corporation Electrosurgical method and system for treating foot ulcer
US8216223B2 (en) 2006-01-24 2012-07-10 Covidien Ag System and method for tissue sealing
US8147485B2 (en) 2006-01-24 2012-04-03 Covidien Ag System and method for tissue sealing
US9642665B2 (en) 2006-01-24 2017-05-09 Covidien Ag Method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US8267928B2 (en) 2006-01-24 2012-09-18 Covidien Ag System and method for closed loop monitoring of monopolar electrosurgical apparatus
US9186200B2 (en) 2006-01-24 2015-11-17 Covidien Ag System and method for tissue sealing
US8663214B2 (en) 2006-01-24 2014-03-04 Covidien Ag Method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US10582964B2 (en) 2006-01-24 2020-03-10 Covidien Lp Method and system for controlling an output of a radio-frequency medical generator having an impedance based control algorithm
US7513896B2 (en) 2006-01-24 2009-04-07 Covidien Ag Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US8187262B2 (en) 2006-01-24 2012-05-29 Covidien Ag Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US7927328B2 (en) 2006-01-24 2011-04-19 Covidien Ag System and method for closed loop monitoring of monopolar electrosurgical apparatus
US8475447B2 (en) 2006-01-24 2013-07-02 Covidien Ag System and method for closed loop monitoring of monopolar electrosurgical apparatus
US8685016B2 (en) 2006-01-24 2014-04-01 Covidien Ag System and method for tissue sealing
US8202271B2 (en) 2006-01-24 2012-06-19 Covidien Ag Dual synchro-resonant electrosurgical apparatus with bi-directional magnetic coupling
US7972328B2 (en) 2006-01-24 2011-07-05 Covidien Ag System and method for tissue sealing
US7972332B2 (en) 2006-03-03 2011-07-05 Covidien Ag System and method for controlling electrosurgical snares
US7651493B2 (en) 2006-03-03 2010-01-26 Covidien Ag System and method for controlling electrosurgical snares
US7648499B2 (en) 2006-03-21 2010-01-19 Covidien Ag System and method for generating radio frequency energy
US8556890B2 (en) 2006-04-24 2013-10-15 Covidien Ag Arc based adaptive control system for an electrosurgical unit
US7651492B2 (en) 2006-04-24 2010-01-26 Covidien Ag Arc based adaptive control system for an electrosurgical unit
US9119624B2 (en) 2006-04-24 2015-09-01 Covidien Ag ARC based adaptive control system for an electrosurgical unit
US8753334B2 (en) 2006-05-10 2014-06-17 Covidien Ag System and method for reducing leakage current in an electrosurgical generator
US8444638B2 (en) 2006-05-30 2013-05-21 Arthrocare Corporation Hard tissue ablation system
US8114071B2 (en) 2006-05-30 2012-02-14 Arthrocare Corporation Hard tissue ablation system
US8034049B2 (en) 2006-08-08 2011-10-11 Covidien Ag System and method for measuring initial tissue impedance
US7731717B2 (en) 2006-08-08 2010-06-08 Covidien Ag System and method for controlling RF output during tissue sealing
US7637907B2 (en) 2006-09-19 2009-12-29 Covidien Ag System and method for return electrode monitoring
US7794457B2 (en) 2006-09-28 2010-09-14 Covidien Ag Transformer for RF voltage sensing
US8231616B2 (en) 2006-09-28 2012-07-31 Covidien Ag Transformer for RF voltage sensing
US20080172076A1 (en) * 2006-11-01 2008-07-17 Alcon, Inc. Ultrasound apparatus and method of use
US8579929B2 (en) 2006-12-08 2013-11-12 Alcon Research, Ltd. Torsional ultrasound hand piece that eliminates chatter
US20100324581A1 (en) * 2006-12-08 2010-12-23 Alcon, Inc. Torsional Ultrasound Hand Piece That Eliminates Chatter
US9254164B2 (en) 2007-01-05 2016-02-09 Arthrocare Corporation Electrosurgical system with suction control apparatus, system and method
US8192424B2 (en) 2007-01-05 2012-06-05 Arthrocare Corporation Electrosurgical system with suction control apparatus, system and method
US8870866B2 (en) 2007-01-05 2014-10-28 Arthrocare Corporation Electrosurgical system with suction control apparatus, system and method
US20080208207A1 (en) * 2007-02-23 2008-08-28 Huculak John C Surgical System For Indication of Media Types
US8109937B2 (en) 2007-02-23 2012-02-07 Alcon Research, Ltd. Surgical system for indication of media types
US7862560B2 (en) 2007-03-23 2011-01-04 Arthrocare Corporation Ablation apparatus having reduced nerve stimulation and related methods
US8777941B2 (en) 2007-05-10 2014-07-15 Covidien Lp Adjustable impedance electrosurgical electrodes
US20080281253A1 (en) * 2007-05-10 2008-11-13 Injev Valentine P Method of Operating an Ultrasound Handpiece
US8303530B2 (en) 2007-05-10 2012-11-06 Novartis Ag Method of operating an ultrasound handpiece
US7834484B2 (en) 2007-07-16 2010-11-16 Tyco Healthcare Group Lp Connection cable and method for activating a voltage-controlled generator
US8353905B2 (en) 2007-09-07 2013-01-15 Covidien Lp System and method for transmission of combined data stream
US8216220B2 (en) 2007-09-07 2012-07-10 Tyco Healthcare Group Lp System and method for transmission of combined data stream
US8512332B2 (en) 2007-09-21 2013-08-20 Covidien Lp Real-time arc control in electrosurgical generators
US9271790B2 (en) 2007-09-21 2016-03-01 Coviden Lp Real-time arc control in electrosurgical generators
US9358063B2 (en) 2008-02-14 2016-06-07 Arthrocare Corporation Ablation performance indicator for electrosurgical devices
US8226639B2 (en) 2008-06-10 2012-07-24 Tyco Healthcare Group Lp System and method for output control of electrosurgical generator
US20100036256A1 (en) * 2008-08-08 2010-02-11 Mikhail Boukhny Offset ultrasonic hand piece
US20100094321A1 (en) * 2008-10-10 2010-04-15 Takayuki Akahoshi Ultrasound Handpiece
US8486061B2 (en) 2009-01-12 2013-07-16 Covidien Lp Imaginary impedance process monitoring and intelligent shut-off
US8574187B2 (en) 2009-03-09 2013-11-05 Arthrocare Corporation System and method of an electrosurgical controller with output RF energy control
US9138282B2 (en) 2009-06-17 2015-09-22 Arthrocare Corporation Method and system of an electrosurgical controller with wave-shaping
US8257350B2 (en) 2009-06-17 2012-09-04 Arthrocare Corporation Method and system of an electrosurgical controller with wave-shaping
US9233021B2 (en) 2009-07-01 2016-01-12 Alcon Research, Ltd. Phacoemulsification hook tip
US8623040B2 (en) 2009-07-01 2014-01-07 Alcon Research, Ltd. Phacoemulsification hook tip
US20110137232A1 (en) * 2009-12-09 2011-06-09 Alcon Research, Ltd. Thermal Management Algorithm For Phacoemulsification System
US8372067B2 (en) 2009-12-09 2013-02-12 Arthrocare Corporation Electrosurgery irrigation primer systems and methods
US8070711B2 (en) 2009-12-09 2011-12-06 Alcon Research, Ltd. Thermal management algorithm for phacoemulsification system
US9095358B2 (en) 2009-12-09 2015-08-04 Arthrocare Corporation Electrosurgery irrigation primer systems and methods
US8747399B2 (en) 2010-04-06 2014-06-10 Arthrocare Corporation Method and system of reduction of low frequency muscle stimulation during electrosurgical procedures
US8784357B2 (en) 2010-09-15 2014-07-22 Alcon Research, Ltd. Phacoemulsification hand piece with two independent transducers
US10258505B2 (en) 2010-09-17 2019-04-16 Alcon Research, Ltd. Balanced phacoemulsification tip
US8568405B2 (en) 2010-10-15 2013-10-29 Arthrocare Corporation Electrosurgical wand and related method and system
USD658760S1 (en) 2010-10-15 2012-05-01 Arthrocare Corporation Wound care electrosurgical wand
US8685018B2 (en) 2010-10-15 2014-04-01 Arthrocare Corporation Electrosurgical wand and related method and system
US9131597B2 (en) 2011-02-02 2015-09-08 Arthrocare Corporation Electrosurgical system and method for treating hard body tissue
US8414605B2 (en) 2011-07-08 2013-04-09 Alcon Research, Ltd. Vacuum level control of power for phacoemulsification hand piece
US9693818B2 (en) 2013-03-07 2017-07-04 Arthrocare Corporation Methods and systems related to electrosurgical wands
US9713489B2 (en) 2013-03-07 2017-07-25 Arthrocare Corporation Electrosurgical methods and systems
US9801678B2 (en) 2013-03-13 2017-10-31 Arthrocare Corporation Method and system of controlling conductive fluid flow during an electrosurgical procedure
US9504516B2 (en) 2013-05-31 2016-11-29 Covidien LLP Gain compensation for a full bridge inverter
US10603098B2 (en) 2013-05-31 2020-03-31 Covidien Lp Gain compensation for a full bridge inverter
US9872719B2 (en) 2013-07-24 2018-01-23 Covidien Lp Systems and methods for generating electrosurgical energy using a multistage power converter
US11135001B2 (en) 2013-07-24 2021-10-05 Covidien Lp Systems and methods for generating electrosurgical energy using a multistage power converter
US9636165B2 (en) 2013-07-29 2017-05-02 Covidien Lp Systems and methods for measuring tissue impedance through an electrosurgical cable
US9655670B2 (en) 2013-07-29 2017-05-23 Covidien Lp Systems and methods for measuring tissue impedance through an electrosurgical cable
CN107049419A (en) * 2017-05-11 2017-08-18 山东大学 A kind of Pediculus arcus vertebrae drilling device and method with force feedback

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